NOW Probiotic Defense
Brand: NOW · Form: CAPSULE [E0159]
Our assessment
The evidence shows that NOW Probiotic Defense is a dietary supplement featuring calcium as a key ingredient. While probiotics support gut health, the calcium component here provides specific benefits for bone health and nerve function. Our assessment: this product may be useful for supporting your bone density and neuromuscular health, but the data is limited to the calcium content alone, not the full probiotic blend [NIH ODS].
How it works
Think of calcium as a foundational building block for your body. It works through bone mineralization, helping to deposit minerals into your skeleton to maintain strong bone density. Additionally, it supports neuromuscular relaxation by aiding nerve signaling and muscle relaxation, which is critical for everyday movement and preventing cramps [NIH ODS].
Safety profile
FDA has received a total of 592,059 adverse event reports across all supplements, but specific report counts for this product are not available. For calcium specifically, high intakes might increase the risk of heart disease and prostate cancer. High levels in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS] [FDA data].
Our recommendation
Start by evaluating your total calcium intake from food and other supplements to avoid exceeding safe levels. Be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. We recommend consulting your healthcare provider before adding this supplement, especially if you take any of these medications or have a history of kidney issues or heart disease. Data on the probiotic-specific benefits of this product is not available.
AI-assisted analysis. Data sourced from NIH DSLD.
Supplement Facts
| Brand | NOW |
|---|---|
| Serving Size | |
| Contents | 90.0 Veg Capsule(s) |
| Market Status | Off Market |
How to Read This Label
Supplement labels contain several key sections regulated by the FDA:
- Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
- Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
- % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
- Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
- Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.
Source: FDA Dietary Supplement Labeling Guide